Alright, let's work through 6378 times 630 step by step
6378 × 630 = 630 × (6378)
+ 630 × 8 producing 5040
+ 630 × 70 what gives us 44100
+ 630 × 300 giving us 189000
+ 630 × 6000 that equals 3780000

= 4018140
